Return-Path: <owner-rsgb_lf_group@blacksheep.org> Received: (qmail 18037 invoked from network); 26 Mar 2003 11:32:04 -0000 Content-Transfer-Encoding: 8bit Received: from netmail01.services.quay.plus.net (212.159.14.219) by mailstore with SMTP; 26 Mar 2003 11:32:04 -0000 Received: (qmail 1874 invoked by uid 10001); 26 Mar 2003 11:32:04 -0000 X-Priority: 3 X-MSMail-Priority: Normal Received: from post.thorcom.com (193.82.116.70) by netmail01.services.quay.plus.net with SMTP; 26 Mar 2003 11:32:03 -0000 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 X-SQ: A Received: from majordom by post.thorcom.com with local (Exim 4.14) id 18y987-0005vu-42 for rsgb_lf_group-outgoing@blacksheep.org; Wed, 26 Mar 2003 11:31:39 +0000 Received: from [147.197.200.9] (helo=hestia.herts.ac.uk) by post.thorcom.com with esmtp (Exim 4.14) id 18y981-0005vd-V6 for rsgb_lf_group@blacksheep.org; Wed, 26 Mar 2003 11:31:34 +0000 Received: from gemini ([147.197.200.44] helo=gemini.herts.ac.uk) by hestia.herts.ac.uk with esmtp (Exim 3.22 #1) id 18y92t-0003qb-00 for rsgb_lf_group@blacksheep.org; Wed, 26 Mar 2003 11:26:15 +0000 Received: from [147.197.232.252] (helo=rsch-15.herts.ac.uk) by gemini.herts.ac.uk with esmtp (Exim 3.33 #1) id 18y92j-0003qs-00 for rsgb_lf_group@blacksheep.org; Wed, 26 Mar 2003 11:26:05 +0000 Message-ID: <5.1.0.14.0.20030326110918.00abac60@gemini.herts.ac.uk> X-Sender: mj9ar@gemini.herts.ac.uk X-Mailer: QUALCOMM Windows Eudora Version 5.1 Date: Wed, 26 Mar 2003 11:25:59 +0000 To: rsgb_lf_group@blacksheep.org From: "James Moritz" <j.r.moritz@herts.ac.uk> In-reply-to: <001401c2f30a$c5cc0560$269437d2@xtr743187> References: <5.1.0.14.0.20030320183946.0260e158@gemini.herts.ac.uk> <5.1.0.14.0.20030324122153.00abb360@gemini.herts.ac.uk> <3E7F197A.4060502@usa.net> <003201c2f247$ee408200$0100007f@xtr743187> MIME-Version: 1.0 X-MailScanner: No Virus detected Subject: Re: LF: Selection of spot frequencies for DX Content-Type: text/plain; charset=us-ascii; format=flowed X-Spam-Status: No, hits=-22.9 required=5.0tests=EMAIL_ATTRIBUTION,IN_REP_TO,REFERENCES,REPLY_WITH_QUOTESversion=2.51 X-Spam-Checker-Version: SpamAssassin 2.51 (1.174.2.5-2003-03-20-exp) X-SA-Exim-Scanned: Yes Sender: <owner-rsgb_lf_group@blacksheep.org> Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group X-SA-Exim-Rcpt-To: rsgb_lf_group-outgoing@blacksheep.org X-SA-Exim-Scanned: No; SAEximRunCond expanded to false At 07:29 26/03/2003 +1200, you wrote: >Hi all, > >I made a numerical mistake in my last posting. 25 Hz shift at 136 kHz is >a ratio of about 0.009, or 0.9%. Of course, we would like the "QRM >deviation" of 50 Hz lines to be much less than plus or minus 25 Hz. > >73, Bob ZL2CA > Dear Bob, LF Group, 25/136000 = 0.00018, or 0.018% for 25Hz shift - a 0.9% shift in the 50Hz mains frequency would lead to the 2720th harmonic shifting by 1224Hz... Cheers, Jim Moritz 73 de M0BMU